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Proof step 6 from proof validval-field-norefval (previous step)

fs = mkfs(class, ty, fieldvar) ⊦ validval(str, r -- fs ', val, st) ↔ okval(val, ty) ∧ fs ' ≠ _length, is_referencevalue(val)

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 5:
⊦ validval(str, r -- mkfs(class, ty, fieldvar) ', val, st) ↔ okval(val, ty) ∧ mkfs(class, ty, fieldvar) ' ≠ _length, is_referencevalue(val)

Rule argument

[emptyarg]

Additional information

[[CONCRETESIMPRULES : ()]]